Patent US2597907A successfully refreshed from Google Patents.
US2597907A
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US
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Apparatus for the separation of gases by fractional permeation through membranes
Assignee: Individual
•
Filing: 1950-03-31
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Granted: 1952-05-27
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Expires: 1970-03-31
Abstract
No abstract record available.
Inventors
- 👤 Waldo A Steiner
- 👤 Sol W Weller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:29
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/22; B01D63/00; B01D63/08; Y; Y10; Y10S; Y10S159/00; Y10S159/27; Y10S159/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-05-27 | 1955-11-26 | 1956-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-27 | 1959-11-26 | 1960-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-27 | 1963-11-26 | 1964-05-27 | $7700.00 | Window Closed / Lapsed |